The Vermont Supreme Court has reversed a drunken driving conviction, ruling that the trooper who approached a driver who had stopped had insufficient reason to do so.

David Button was driving on a rural gravel road in Berkshire late in the evening of Nov. 19, 2011, when he pulled over and stopped. A trooper who had been following him pulled in behind Button to check on his welfare.

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During their encounter, the trooper, Jay Riggen, developed evidence that Button was driving while intoxicated.

But the court threw out Button's conviction, saying he had not been driving erratically and the trooper lacked sufficient cause for a stop.